Nonsemantic markup in required form fields

[mdawaffe]

We currently output <sup class="required">*</sup> for required form inputs. I'm unclear if this is decent semantic markup, and, when it is outputted by template functions, is not very nice to theme authors.

Attached replaces the markup with generated content from CSS.

I'm not that worried about it not working in IE. Theme authors can use the CSS classes to change background colors or whatever if they're interested.

Thoughts?

[sambauers]

Having forms in tables isn't semantically correct to start with :)

I'm not sure about using <sup> as we do, but I don't think CSS generated content is particularly friendly to assisted access devices (I could be *completely* wrong though).

If we are going to change the structure of our forms I think we should be complete about it.

[sambauers]

(In [2177]) Prettier Kakumei including a more semantic form markup. Fixes #949